Quantized Channel State Information Precoding for Wireless Systems
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Solution Overview
Problem
In data transmission systems with multiple antennas, the limited bandwidth for uplink communication leads to quantization noise in channel state information, resulting in inaccurate precoding matrices and deteriorated transmission performance, especially when channel conditions change.
Innovation Solution
A base station apparatus that receives quantized channel state information, determines the control ratio of interference signal to noise, and computes a precoding matrix using singular value decomposition to optimize data transmission, minimizing the effects of quantization noise and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If quantized channel state information is used to reduce uplink bandwidth requirements, then device complexity and resource utilization are improved, but measurement precision and transmission performance deteriorate due to quantization noise
Solution Approach 1:
The patent changes the parameter of channel state information from full precision to quantized precision, reducing the number of bits transmitted while maintaining acceptable performance through optimized precoding that compensates for quantization effects
2Reliability
If closed loop multiple transmitting/receiving antennas are used to improve data transmission performance, then transmission reliability is improved, but device complexity and uplink resource consumption increase due to channel information feedback requirements
Solution Approach 1:
The patent uses partial channel state information (quantized version) rather than full channel information, achieving sufficient performance improvement without the complete complexity of full closed-loop systems with accurate channel feedback
3Reliability
If accurate channel state information is transmitted from terminal to base station, then data transmission performance is improved, but loss of information increases due to limited uplink bandwidth
Solution Approach 1:
The patent extracts only the essential information from the full channel state by using quantization, retaining the most important characteristics needed for precoding while discarding redundant information that would consume valuable uplink bandwidth
Data Source
AI summary
A base station apparatus including a receiving unit to receive, from a terminal, quantized channel state information with respect to a radio channel from a plurality of transmission antennas of the base station apparatus to a plurality of receiving antennas of the terminal. A control unit to determine a control ratio of interference signal to noise with respect to the radio channel based on the channel state information. A precoding matrix computing unit to compute a precoding matrix based on the control ratio of interference signal to noise and a transmission unit to transmit data to one or more of the connected terminals using the precoding matrix.